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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: combjelly who wrote (391046)	6/16/2008 1:07:42 AM
From: tejek	Read Replies (1) \| Respond to of 1576588

" I don't know, because I don't know what the situation was 300 years ago or 3000 years ago." Easy enough The silence is deafening.

To: combjelly who wrote (391046)	6/16/2008 1:14:56 AM
From: d[-_-]b	Read Replies (1) \| Respond to of 1576588

To sum it up, for thousands of years the atmospheric concentration was somewhere around 280 ppm. Starting in the 1800's, the level started to climb. It is now above 380 ppm. And before that? geocraft.com Earth's atmosphere today contains about 380 ppm CO2 (0.038%). Compared to former geologic times, our present atmosphere, like the Late Carboniferous atmosphere, is CO2- impoverished! In the last 600 million years of Earth's history only the Carboniferous Period and our present age, the Quaternary Period, have witnessed CO2 levels less than 400 ppm. earth.geology.yale.edu sciencemag.org

To: combjelly who wrote (391046)	6/16/2008 9:24:50 AM
From: i-node	Read Replies (3) \| Respond to of 1576588

As I pointed out, the real question whether it matters that CO2 levels are now 100ppm higher than the historical highs. There appears to be no consensus amongst scientists, although there clearly is amongst uninformed liberals. Like anything else done to excess, consuming fossil fuels to excess probably has some adverse consequences. But for the short period of time we are likely to be using fossil fuels in quantity -- a couple hundred years at the very most -- the likelihood of it harming the planet (which has, of course, survived a lot of bad stuff over the years) is pretty much nil.